Make use of new changes in libunwind to decode a pointer which has a pointer authentication code (PAC) in it. Before this patch, perf is not able to produce stack traces where the instruction addresses had PACs in them. This commit has a dependency on a libunwind pull request: https://github.com/libunwind/libunwind/pull/360 Signed-off-by: Andrew Kilroy <andrew.kilroy@xxxxxxx> --- tools/perf/util/unwind-libunwind-local.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c index 6e5b8cce47bf..6983a3e76a71 100644 --- a/tools/perf/util/unwind-libunwind-local.c +++ b/tools/perf/util/unwind-libunwind-local.c @@ -652,6 +652,15 @@ static void display_error(int err) } } +#ifndef NO_LIBUNWIND_ARM64_PTRAUTH +static unw_word_t get_insn_mask(unw_addr_space_t addr_space __maybe_unused, void *unwind_info_ptr) +{ + struct unwind_info *ui = unwind_info_ptr; + unw_word_t mask = ui->sample->ptrauth.insn_mask; + return mask; +} +#endif + static unw_accessors_t accessors = { .find_proc_info = find_proc_info, .put_unwind_info = put_unwind_info, @@ -661,6 +670,9 @@ static unw_accessors_t accessors = { .access_fpreg = access_fpreg, .resume = resume, .get_proc_name = get_proc_name, +#ifndef NO_LIBUNWIND_ARM64_PTRAUTH + .ptrauth_insn_mask = get_insn_mask, +#endif }; static int _unwind__prepare_access(struct maps *maps) -- 2.17.1
